Alcula, Online Calculators

Simple to advanced calculators for math and statistics, units conversion and more...

It supports fractions, complex numbers and custom functions. It has an expression history
so you can review your previous steps. You can also update a previous expression and all following expressions are updated automatically. A useful resource for students and teachers of mathematics.

Calculate percentage change. Add and subtract percentages. Answer questions like: How much is ... percent of ... ? What percentage of ... is ... ?

More calculators (accessible from the top navigation links)

Statistics Calculators - Compute measures of location and dispersion.

Started as a simple standard deviation calculator, it now also calculates mean (average), median, mode, variance, quartiles,
inter quartile range and deviation, and mean absolute deviation. Like other calculators on this site, the statistics calculator will be expanded over the next few months, to include more common statistics formulas.

Simple Printing Calculator - A virtual 9 digit pocket (!) calculator.

This Virtual Calculator emulates a real pocket calculator. It features basic operators and a virtual paper roll that displays your previous calculations. Type on your keyboard or use your mouse to press
the buttons.

Suan Pan and Soroban emulators - Practice using the Chinese and the Japanese abaci.

Suan Pan is the Chinese name for the Chinese abacus. It has two decks, the lower deck has 5 beads for each rod, the upper deck has two.
The version of Suan Pan on this website has 18 rods, you can perform calculations with numbers up to 18 digits.

Soroban is the Japanese name for the Japanese abacus. Like the Chinese abacus, it has two decks, but the lower deck has 4 beads for each rod and the upper deck has only one. The Soroban on this site has 18 rods.

The abaci emulators require javascript to be enabled in your browser.

Units conversion. - Convert lengths, areas, weights and temperatures.

Select 'conversions' to go to the conversion pages. You can convert between many units of measure of length,
area, weight or temperature.